<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>外部样式表</title>
<!--  <link href="css/style.css"  rel="stylesheet" >-->
</head>

<body>
<h1>静夜思</h1>
<p class="clsName">床前明月光</p>
<p id="p2">疑是地上霜</p>
<p>举头望明月</p>
<p class="clsName">低头思故乡</p>

</body>
</html>